Student Grade St Vincent Tube Occluding Forceps; Smooth Jaws; Curved; 6.5" Length. Tube occluding forceps can be used in almost any surgery where fluid or blood in tubes needs to be stopped. One such surgical procedure is when a perfusion is involved. During perfusions blood flow is re-directed from the heart to a series of tubes that directs the blood back to the patient's tissue. The tube occluding forceps are ideal when flow of blood must temporarily be stopped. They tightly grasp the tube and can be set and kept in place.